dwarf2: avoid decoding .debug_line for type units

Running gdb.dwarf2/pr13961.exp with clang fails with an internal error:

  gdb/dwarf2/read.c: internal-error: decode_line_header_for_cu:
  Assertion `!cu->per_cu->is_debug_types ()' failed.

pr13961 is a legacy .S test that references a .debug_line label from
both a CU and a TU.  The assembly includes an empty .debug_line section
declaration:

  .section .debug_line,"",%progbits
.Ldebug_line0:

With gcc this results in a dummy (valid, but content-less) .debug_line
header being emitted, so GDB can build a line header and resolve file
indices.  With clang the .debug_line section can be missing/empty,
leaving the line header unset.

During symbol creation, new_symbol may then try to lazily decode the
CU-only line header while processing a type unit, which triggers the
assertion above.

Fix this by only decoding the line header for non-type units.  If no
line header is available, emit a complaint and continue without setting
the symtab rather than attempting CU-only line decoding from a TU.

Tested: gdb.dwarf2/pr13961.exp (CC_FOR_TARGET=clang-23)